Research on the Thermal Conductivity and Microstructure of Calcium Lignosulfonate-Magnesium Oxide Solidified Loess
Source abstract
Abstract
Loess, characterized by high porosity, a loose structure, and weak cementation, is highly prone to deformation and cracking under thermal stress, which significantly affects the bearing capacity of foundations and the stability of underground engineering structures. This study introduces an innovative approach that utilizes the eco-friendly modifier calcium lignosulfonate (CL) in combination with magnesium oxide (MgO) for the carbonation solidification treatment of loess. The research systematically investigated the thermal conductivity and underlying micro-mechanisms of the treated soil. A series of tests, including analyses of basic physical properties, measurements of thermal conductivity, X-ray diffraction (XRD), and scanning electron microscopy (SEM), were conducted to evaluate the effects of CL dosage, freeze–thaw cycles, moisture content, and dry density on the thermal conductivity of carbonation-solidified loess. The results indicate that carbonated solidified loess absorbed approximately 6% of CO2, while effectively reducing its collapsibility grade to a slightly collapsible classification. Additionally, its thermal conductivity decreased by 16.7%, thereby mitigating the influence of various environmental factors. Based on the experimental results, a microscopic mechanism model was developed. This study presents a sustainable and innovative technical solution for stabilizing loess foundations in cold regions.
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Research context
OpenAlex topics: Geomechanics and Mining Engineering
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Civil Engineering and Water Resources, Qinghai University, Xining 810016, China
Key Laboratory of Energy-Saving Building Materials and Engineering Safety, 251 Ningda Road, Xining 810016, China
Funding
Qinghai Provincial Central Guidance Local Science and Technology Development Fund Project · The National Natural Science Foundation of China · The Fund of China Scholarship Council
References (50)
Show source-provided references
1. Thermal conductivity of sands under varying moisture and porosity in drainage-wetting cycles10.2136/vzj2009.0095 ↗
2. Geological hazards in loess terrain, with particular reference to the loess regions of China10.1016/S0012-8252(01)00050-2 ↗
3. An improved model for predicting soil thermal conductivity from water content at room temperature10.2136/sssaj2006.0041 ↗
4. Experimental study of thermal conductivity in soil stabilization for sustainable infrastructure10.3390/su16030946 ↗
5. Stabilization of expansive soils using chemical additives: A review10.1016/j.jrmge.2022.10.006 ↗
6. The effect of cement/lime on the performance of coastal saline soil for roadbed
7. Experimental study on the performance of lime and cement- improved expansive soil
8. The effect of polypropylene fibers and TG curing agents on the strength and stability of cement lime soil
9. Research on design methods for the strength ratio of alkali slag lime stabilized soil
10. Subgrade improvement with mixed lime and cement as additives
11. Readily implementable techniques can cut annual CO2 emissions from the production of concrete by over 20%10.1088/1748-9326/11/7/074029 ↗
12. Research and application progress of lignin in soil improvement and remediation
13. Study on soil heavy metal contamination and its remediation using lignin-based adsorbents: A review10.1016/j.eti.2024.103958 ↗
14. Xia, F. (2022). Application Research of MgO2-MgNCN/MgO System in Soil Pollution Remediation. [Master’s Thesis, Huazhong University of Science and Technology].
15. Field-applied biochar-based MgO and sepiolite composites possess CO2 capture potential and alter organic C mineralization and C-cycling bacterial structure in fertilized soils
16. Environmental impact and life cycle assessment (LCA) of traditional and ‘green’ concretes: Literature review and theoretical calculations10.1016/j.cemconcomp.2012.01.004 ↗
17. Accelerated carbonation–a potential approach to sequester CO2 in cement paste containing slag and reactive MgO10.1016/j.cemconcomp.2013.07.001 ↗
18. Atomic force microscopy reveals how relative humidity impacts the Young’s modulus of lignocellulosic polymers and their adhesion with cellulose nanocrystals at the nanoscale10.1016/j.ijbiomac.2019.10.074 ↗
19. Characterization of mechanical properties of five hot-pressed lignins extracted from different feedstocks by microscopy-aided nanoindentation10.1016/j.matdes.2023.111765 ↗
20. Towards lignin-based functional materials in a sustainable world10.1039/C5GC02616D ↗
21. Experimental investigation on thermal conductivity of MgO-improved loess under different densities and water contents
22. Experimental investigation of thermal and mechanical properties of lignin treated silt under freeze-thaw cycling
23. Initial investigation into the carbonation of MgO for soil stabilisation
24. Influence of organic matter and carbonation time on engineering performance of reactive MgO carbonated soils10.1016/j.jobe.2025.112257 ↗
25. Liu, Z., He, H., Li, M., Zheng, S., Liu, S., and Zhang, D. (2025). Factors and Mechanism of MgO Carbonation Enhanced Recycled Fine Aggregate. J. Southeast Univ. (Nat. Sci. Ed.), 1–11. Available online: http://kns.cnki.net/kcms/detail/32.1178.N.20250318.0955.002.html.
26. Investigation of carbonation depth and its influence on the performance and microstructure of MgO cement and PC mixes
27. Effects of MgO particle size and density on microstructure development of MgO-based composite materials
28. Water retention and water stability of loess modified by lignin
29. Freeze-thaw performance of silt sand treated with lignin
30. Research on the Technology and Application of Industrial Waste Lignin Stabilized Improved Fine Soil Subgrade
31. Microscopic Mechanism of Lignin-Modified Subgrade Silt Using Industrial By-products
32. (2017). Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils (Standard No. ASTM D4318-17).
33. (2012). Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort (Standard No. ASTM D698-12e1).
34. (2014). Standard Test Method for the Evaluation of the Collapsibility of Soils (Standard No. ASTM D5333-14).
35. (2015). Testing of Concrete-Part 12: Determination of the Carbonation Resistance of Concrete (Standard No. ISO 1920-12:2015).
36. (2016). Standard Test Methods for Frost Resistance of Concrete (Standard No. ASTM D560-16).
37. (2014). Standard Test Method for Thermal Conductivity of Soil and Soft Rock (Standard No. ASTM D5334-14).
38. Yi, Y., Liška, M., Albe-Tabar, A., Liu, S., and Du, Y. (2025). A Green Low-Carbon Curing Agent for Soil Solidification. No. CN201010604325.2; Patent No. (CN102071029A).
39. Experimental study on the wet-dry cycle characteristics of active MgO carbonized solidified soil
40. Experimental Study on the Limit Water Content of MgO Modified Carbonized Shield Tunnel Centrifugal High Liquid Limit Silt
41. Characterisation of different commercial reactive magnesia10.1680/adcr.13.00004 ↗
42. Properties and microstructure of GGBS-MgO pastes10.1680/adcr.13.00005 ↗
43. Study on sulfate resistance of activated MgO carbonized solidified soil
44. Study on the microscopic mechanism of improving subgrade silt based on industrial byproduct lignin
45. Farouki, O.T. (1986). Thermal Properties of Soils, Trans Tech Publications.
46. Effect of expanded perlite on the mechanical properties and thermal conductivity of lightweight concrete10.1016/j.enbuild.2010.11.008 ↗
47. MgO expansive cement and concrete in China: Past, present and future10.1016/j.cemconres.2013.12.007 ↗
48. A review of the influence of freeze-thaw cycles on soil geotechnical properties10.1002/ppp.559 ↗
49. Stabilization of an erodible soil using a chemical admixture10.1680/grim.2010.163.1.43 ↗
50. Influence of initial water content on the strength and resistivity of MgO carbonized silt